On January 22nd, the US Postal Service updated their API with new pricing. Along with this, they also changed how domestic First Class Mail worked, which broke many ecommerce applications, including ShopSite.
ShopSite released a patch on Tuesday January 24th, and we promptly patched all Version 11 SP1 stores we host. First Class rates are now working as they should.
If you are running a ShopSite version older than 11 SP1, you should consider upgrading if you need to return USPS First Class rates.
For more information about this issue, check out our recent blog post about the US Postal Service Change.
- LexiConn Support